Go high enough, interest payments consume the entire federal budget. There is no way out except revenue growth (infeasible without breakthrough productivity improvements), taxation, and printing money (equivalent to taxation). Before that point, other bad things happen such as creditors losing faith in the government, making debt more expensive and destabilizing the dollar's position as global reserve currency.
Over the last few decades, debt has continued to rise as a percentage of the federal budget, and appears that trend will continue without drastic action.
At the end of the day, the Japanese market is huge and people want access to it. Same thing goes for the US.
If the private market doesn’t want bonds, the central bank can purchase them. That’s not inflationary. What is inflationary is how the government then spends that money, but that’s true for any government spending, regardless of how it was financed. Either way, the debt ratios is literally meaningless.
Central bank buying bonds and increasing money supply absolutely is inflationary. That is precisely how FOMOs work, with the end goal being increasing or decreasing money supply depending on inflation and labour market. So if you already have stubborn inflation and you have a fiscal crisis then unmooring inflation expectations by lowering rates is exactly what you don't want to do (risk becoming a banana republic that inflates away it's debt). I don't think this will happen in the near future but it is absolutely a risk and you'd be foolish as a central banker not to consider it.
1. Nobody is losing confidence in the US over debt ratios. Japan’s debt ratio is over 300%, and they’ve had no issues with financing their spending or capital flight. This is a myth that has been proven false.
2. If the private market doesn’t want to purchase bonds, the central bank can do it. Either way, there is never a need to default on debt owed in your sovereign currency. This will never happen. The risk here is inflation, but that risk is always present, regardless of how spending is financed.
1. Japan is a net creditor nation, meaning it owns more foreign assets than it owes in debt. The U.S., on the other hand, is a net debtor nation, meaning it relies heavily on foreign investors to finance its deficits. Japan also has a high domestic savings rate, and a large portion of its debt is held by its own citizens and institutions. This reduces capital flight risks compared to the U.S., which depends more on foreign investors (e.g., China, Japan, and others buying U.S. Treasuries). The U.S. dollar is the world’s reserve currency, which gives the U.S. unique advantages, but also means its debt is held globally. A loss of confidence in U.S. debt could have larger consequences compared to Japan.
2. U.S. benefits from strong global demand for the dollar, but this is not guaranteed forever. If the Federal Reserve were to absorb all bond issuance ( basically monetizing the debt), inflation expectations would rise sharply, leading to a currency crisis or higher interest rates. Zimbabwe and Weimar Germany are extreme examples of this.
U.S. essentially "exports" its debt due to its persistent trade deficits. U.S. runs large trade deficits, meaning it imports more goods than it exports. Other countries (like China and Japan) accept U.S. dollars in exchange for their goods, and then reinvest those dollars into U.S. assets, primarily Treasury bonds. This has helped finance U.S. debt at low interest rates for decades. If global confidence in U.S. debt declines, foreign demand for Treasuries could drop, leading to a weaker dollar, higher interest rates, and inflationary pressures.
All of your comments in this thread are misleading.
This statement is very misleading. The Bank of Japan holds 45% of all outstanding bonds.
>> If the private market doesn’t want to purchase bonds, the central bank can do it.
This is NOT sustainable. Arguing that it did not fail yesterday or last year is not evidence that it won't occur. History rhymes with itself.
I don't know what the fallacy of "something is the same along one dimension, therefore the situation along some other dimension(s) must be the same too" is called, but this is a clear example.
Do YOU actually understand the underlying mechanics? Your questions suggest that you do not.
